Antex 690SD (and SD50) Soldering Station teardown and fix

Many years ago my Antex 690SD packed in, and as I was in a bit of a bind I just bought another. That was about twenty years ago so it's about time I had a crack at fixing it.

INDEX
0:00 Index
0:10 Introduction: two Antex 690SD soldering stations, one is dead
0:42 What's wrong with it?
1:19 A tour of the outside and its functions
3:23 A quick look inside and a big schematic
3:30 How the display works
5:10 More schematic shenanigans
6:23 What's most likely to have failed?
6:40 A quick look inside the iron
7:02 Removing and testing a suspect MOSFET
8:08 All fixed?
9:29 DIN jack ring hack
10:06 side-by-side test

[martinda]

I do love Antex irons. They look so perfect. I still have my first x25 and I wanted to say, ''still working'! Yet, I kid you not I plugged it in -while your teardown was still running - to fit a replacement battery, and nothing... The element had gone when all I wanted to do was say it's been ultra reliable. So I've just been looking for replacement elements and there is a similar one, but these have three screw holes for mounting and to fit the 'hook' which also has three holes... Anyhow, they are still remarkable things. Super value and imagine how many budding electronic engineers started off with a 15W Antex and their copy of ETI? (and Beano).
Glad I found your channel.

[faiyazuddinmohammed]

sir i have
ANTEX 650SD, The problem is lock display, any press button show lock....
how to solve this problem...